.popup {
    position: fixed;
    left: 50%;
    top: 50%;
    -webkit-transform: translate(-50%, -50%);
    transform: translate(-50%, -50%);
    z-index: 9;
    display: flex;
    flex-direction: column;
    background-color: #fff;
}
.popup-title {
    flex: none;
    height: 30px;
    padding: 12px 14px;
    line-height: 30px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    background-color: #f5f5f5;
}
.popup-title h3 {
    font-size: 18px;
    font-weight: 400;
    color: #424242;
}
.popup-title i {
    width: 30px;
    height: 30px;
    line-height: 30px;
    text-align: center;
    color: #757575;
    cursor: pointer;
    -webkit-transition: all .2s;
    transition: all .2s;
    z-index: 10;
    border-radius: 15px;
}
.popup-title i:hover {
    color: #fff;
    background-color: #e53935;
}
.popup-content {
    flex: 1;
}
.popup-mask {
    position: fixed;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 8;
}